Davos could make out the striped hulls of Salladhor Saan's ships beyond, but he knew he would never reach them. A wall of red-hot steel, blazing wood, and swirling green flame stretched before him. The mouth of the Blackwater Rush had turned into the mouth of hell.
–George R.R. Martin, A Clash of Kings
The War of the Five Kings has reached its tipping point. Stannis Baratheon marches on King’s Landing by land and by sea, sending his powerful navy up the Blackwater Rush to seal off any escape. Tywin Lannister moves south with all speed, leaving the north to House Stark and House Greyjoy, but his mighty armies will never arrive before the city is besieged. In the end, the man who sits the Iron Throne at the end of the battle may be determined by nothing more than the ingenuity of Tyrion Lannister’s defenses.